Alvin 14 oz Lab Metal Hi Temp Repair and Patching Compound Withstands Temps Up To 1000F Foundry core boxes Duct work Radiators Molds Mufflers, exhaust systems, engines Wood and coal burning stoves, grills, industrial ovens Dented metal, prior to powder coating Hi-Temp Lab-metal is recommended where original Lab-metal may not withstand the extreme heat Hi-Temp Lab-metal adheres permanently to any clean and dry metal, wood, hard plastic, glass Hi-Temp Lab metal will withstand temperatures as high as 1000F.